Merged mesh export Documentation
There are two options how to export merged mesh from 3ds Max now.
1. The first one is the Vanilla way of CryENGINE. You can find everything about it here:
2. The second one is slightely different. It allows you to have multiple elements deformed with just one spline. That can be useful for complex flowers and will save some performance on those. In that case only one spline per node is needed.
You can choose which way you want to use in exporter's node options or on the node itself (those are actually exactly the same settings) and it is called "Merge veg. islands". When the box is checked the second way is used.